Calculating-machine.



' TED;STATS P-ATENT QFHCE;

leeLeUmING-Mcema Y 1,147;034 l f Y l ,1- peccation of Letters Patent. lPatented Ju1y20, 1915.' f A. 'A'Ppiicatiqnnleduly 14,1909;`SeriaINc.507,517;`y f I' To allwhom'it'may concern. l f 'f side columncontains radially opposite each *Bey 1t lmovvnthat I, WILLIAM C.MIGH`AEI.,A of thejaboveffractions its Correspendingv .l Y a citizen oftheUnited States,` anda resident decimal equivalent. Radiallyl oppositeand of 'Claremont, in? the countyof Sullivan, outside'of'each. of thesedecimal equivalents State of .New Hampshiregfhave'invented an is aperforation 54 which is `adapted to re-- eo improvement inCalculatingfMachines, of ceive the poin'tof a stylusor' encil for turn#'fvijvvhich the' following description, vin connec-` ing. the dial,;-asmore fully ereinafter ,de-A v y tion 1 ,with theaccompanyin'gfdrawings,'-is a" scribedsf It will be observedA that allof they J' especiflcation',"like letters vr"on the drawings numbersonthis dial arefractions vorlthcir. U1v10@relnesenting' like parteiv 'd pY i decimal equivalents' and said dial may be .is YL nifelltioll`relates to calculating dereferred .to as the traction di'aLv igrvicesfand among; other objects provides a It'wfill be understood'thatthis invention f -'jfmechanism'which issimple infconstructiom is notlimitedto the particular quantities or' Y, eiiicientinperationlandsutlicientlysmall to `numerical values shown-herein, 'butthat l15 be readily carried inthe pocket of the: user. "other values maybe readilyused as desired. 7b.

j Thcch'aracter of this invention -Inay vbeVV `f Goperating'withthisdial'is 'a units'dial g f best understood by reference'to'the'follovving2 v(Fig. 2),/ also inclosed Within thecasing description 'of an'illustrative embodiment 34 and iskeyed tothe reduced end of a hub?thereoffshown inthe-accompanying draw` ['14 (Figs-.i6 andf8)journaledon'a hollow 'f zo'ing, wherein: 5j stud "19 connecting-'thebase of vSaid-casingl 'N5's Figurej1js aV planfview ofa calculating vandsaid face-plate'. On thisfdialin indeviceembodyingi'this invention; Fig.i2 is delible` .igures is marked a circular column 'a similar vievvwiththe cover-plate removed;` "containing'numbers from lato 10 and. oppo-Figiis avertical, centralsectiontaken ony site each of-these numbers isa-p'erforationf 25 the'plineGj-lHofFrig. 2;;Figf4is a section 56 adaptedto receive 'the istylus or pencil lo 'ltakenon thefflineK-#L o'Figif2;Fig. 5 is point similarly as inthecase of the dial 1.y f Y a AsectionytakenonfthelinepI-J of Fig.`2; '.llhisdial 2 is adaptedto turn one-tenthof a Fig. 6 isa'sectiontaken ontheline of rotation Iforfone complete*rotation of the L Fig. 2; Filg?" isf asection taken on' the line-dial 1. To th's' end the latter is provided SOIA-f-B of .Figf2g@andjFi`g.8 is ai section :with a nosing or tooth29 vvhichherein :isiltakenrontheiline EF of Fig.'2. secured-to`-- said dialby-suita'blerivets 5 1 'f f Referringto the drawingsftheillustrative and52: Once in -eachfrotation'of the dial 1` calculatingf device embodyingthis invention this tooth engages one lofthef'teethof-*a small comprisesempl-Shared Casing 34;(Fg- 3),; Pn0n"4",`(FlgS-2'w16) Secured@ sind? 35vv-hichjv 'may'fbe con! v eniently vlformedof oney pin 16 mountedfinabearing 21"Which is se# 90 fpiece'jofrnetallandis providedvvith a cover'cured to thebottorn of theca'sing'l (Fig.` Y, 1 'nime-plate' ljvvhichmay -bef Secured to` fr 6). The .upvvardmovelnent-of'said pinion if Ysaid'f'ca'sing vby fhollovv'jfcorne'r rivetsj?, 38, is limitedfby'itsengagementyviththe under f 39 and 40. WWithin; thiscasing and directlyface ofthe-dial 2.1 rIIhis pinion is adapted 40 beneath Said age-plateis provided a disk t0 engagethe teeth of a gear 23 (Figs. 4 and 95.pl'ifsecured Y"on the reducedy 'end of ahub 13 6)-vvhich iskeyed-to thereduced end of said Y "(.Fig.13l)"jurnaled 'ona.bearing stud-18 rivfj.dial'hubf14 andrests on 'a Washer'32 which' i etedjorothervviseCsecured'vto the `base ofjsaidk isal'so keyed to said hub. The pinion 4does "casing andfto .the Vface-plate; `O n ltheouter'` notfof itselfturnthe gear 23one-tenth of a 4Vaface ofthisdislr is afdial or scaleconsisting 'revolution butl simply'gives jit an initial 100 j.ofcharaeters arrangedfin the'formof conf" movement.` .V -To completethe. one-tenth turn 'f' centric columns yeach"comprising:herein a ofsaid dial 2 `the latter 1s peripherally series, of figures, LfThecircular columnn'ear-fy notche'adj(Fig. 2) to constitutea ratchet coiestthehub ofsaiddial'(Fig. 2) herein conr operating vvith a pavvl having'a kvvedge.--

'5 0' f jdd andevenfsixteenths from lto shaped Anose 61 vwhich .isadapted to rbe 105 lsts o v16"andinayfbeconsideredto' representthepressed into the' notchesf'betvveen'the teeth loffone in lh;tl '1`e nextcolumnfcqnsists yof saidvdial by a lea-f spring lQf-Asshovvn fthefoddthirtyseconds fronl toj32/32; f"infFig. 2 beneath thebrokenlavvayportion "fi'fhsj rrojrfto @mamie nxtiand" out-'framed tpermit the-laaerto'ebefrotated inlA no ..lnfmer l( vilith numbersl to 9rreading ina i si. struction of the device, 1A willV now describe i 1;its use.;V `Itinaylbesupposed,-for example, l'

Y HVopening designated.,byfthelcirclef (Figs.

y l 3 totheirvv Azero g; the' circles mandIZlgrespefgively.y "Now placethe pencil YorfY stylus @point Vthe perP foration thegccntra-clockwisesixteenths column of the 4 Y index dial, and' turn-the dial 1 in aclockwise directionfuntil the stylus pointl reaches l the stop76 in'thecover-plate, thereby bringj ing 11` beneath the answer-openingV 66, Thespring 45 will accurately position the numeral 11-.centrally beneathsaid opening as described.V The decimal equivalent .6875 of s 11 willsimultaneously `appear under the answer-opening 63.V Now place thepencil or stylus Apointin the perforation 54 'ally opposite number49 inthe vcontra-'clock- V1 ina;clockwise direction until the point 0f f thestylus@ again strikes the stop 76 and comes tothe zero point. By thismovement the number 29 ;will appear through the opening 6land throughthe units answeropening 7 3the numeral 1 on the 'dial 2 will 'f 'appearand the machine will register 1 and 2 9/64. The denominator of thefraction VVis 64 since Vthe 29"'a'ppearing in the answeropening 64, isin the sixty-fourths column. -While the dial 1 wasrotatedin bringing thenumber 4 9 to thezeroipointth'e tooth 29.

grotatiom as described, Vthus causing the nuf meral 1 to appear throughtheA answer-'open- ,".55 to ksl'ibtract 21/32-'from the abo'vefresult, 1andY 29/64. To make" this calculation place s i the pencil orystyluspoint in 'the-perforation 54 radially oppositenumber 21 in theclock-Y :Wise thirty-seconds column and turn the dial v-0-1in a'contra-clockwise direction until the point of thestylusstrikes'the stop76, causingthe numeral 51 to appear through the .answer-opening 64,'indicating 51/64. yThe i units answer-opemng will read kzero again, ksinofetlle dial vtooth-29 againengaged the vand )lfof .thje' dial ifandturn'said d ialy ntilsad Point engages thfstop 7.63.(Fg- 1')y p lOpposite` number"3 on the'contra-clockwise larly'turn the unitsdial`2`and theftens dial l positions` by inserting the stylus pointA in the.perforationsl designated li'radially opposite numbervll vice foraddingand subtracting whole numradif dimensions ondrawings etc. i wisesixty-fourths f column and vturnV the dial' Y.: (FigQ2) engaged'thefpiniontlitandA Iapeg a ro a 1011; rin

ysaid gear, l v pendently of-said tooth, and a spring pressedgetherfwithfits numeral` dial, one-tenth of` a pinion 4, and rotated thelatter in aclocklwis'edirection which Y'causedlthe gear 23 to rotate 1na contra-clockwise directior onetenth of a rotationandf'back toitsoriginal starting point-zero.v The inal answer is,

) therefore, 51/464: andits decimal equivalent .7 9687 appears throughthe answer-opening r"If, `'for example,jit is desired to add theperforation 56 in said units-dialfradially indexydi'ail andturn the dial2 in a clockwise directionuntil number 3,' appears through"ftheanswer-opening 7 3. l y'Ehen proceed as der` lscribed above inthe.caseofadding 11/16' and 4ta/6 4'. f '1 l l By this` ventionyis'provided simple de-Y bers, fractions, decimals etc., by simplyrotatingthe numeral dials clockwiseor'contraclockwlse without thenecessity of any external attachments or adjustments, suchastheshift-key hitherto necessar to change from addition to subtraction.V

l he device is par-` ticularly advantageous for draftsmen and engineersrin adding or subtracting whole numbers, fractions and decimalequivalents with speed and accuracy when checking upy ico shown hereinand that various modifications may be` made without departing from thespirit and scope of my invention.

Claims.

1. A'device of the classdescribed comprising, in combination, a dialhaving a dri-ving tooth thereon, a-dial of higher denomination having aratchet and gear connected therewith, a pinion adapted to transmit aninitial turning movement only fromA said tooth to said gear being.movable indeing,

in combination, a fixed index dial hav- `lng concentric seriesofclockwlse and contraclockwise reading figures, movable dial means foradding and subtracting in succession se lected figures on said dial, asecond dial having concentric series of clockwise and contraclockwisereading figures,

figures', and means for moving said secon tion of said first-named dialmeans, said a second movable dial means for adding'or subtractingy saicldial means one step for cach complete rotai means permitting` theindependent movey ment of said second rdial means in anyposition of saidfirst-named dial means.

